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DS2438: Smart Battery Monitor Data Sheet (Rev. 2)7/12/2005PDF383K
Overview
Features and Benefits
- Unique 1-Wire interface requires only one port pin for communication
- Provides unique 64-bit serial number to battery packs
- Eliminates thermistors by sensing battery temperature on-chip
- On-board A/D converter allows monitoring of battery voltage for end-of-charge and end-of-discharge determination
- On-board integrated current accumulator facilitates fuel gauging
- Elapsed time meter in binary format
- 40-byte nonvolatile user memory available for storage of battery-specific data
- Operating range -40°C to +85°C
Product Details
The DS2438 remains in production, however, for new projects, we recommend ModelGauge m5 MAX17215 fuel gauge.
The DS2438 smart battery monitor provides several functions that are desirable to carry in a battery pack: a means of tagging a battery pack with a unique serial number, a direct-to-digital temperature sensor which eliminates the need for thermistors in the battery pack, an A/D converter which measures the battery voltage and current, an integrated current accumulator which keeps a running total of all current going into and out of the battery, an elapsed time meter, and 40 bytes of nonvolatile EEPROM memory for storage of important parameters such as battery chemistry, battery capacity, charging methodology and assembly date. Information is sent to/from the DS2438 over a 1-Wire® interface, so that only one wire (and ground) needs to be connected from a central microprocessor to a DS2438. This means that battery packs need only have three output connectors: battery power, ground, and the 1-Wire interface. Because each DS2438 contains a unique silicon serial number, multiple DS2438s can exist on the same 1-Wire bus. This allows multiple battery packs to be charged or used in the system simultaneously. Applications for the smart battery monitor include portable computers, portable/cellular telephones, and handheld instrumentation battery packs in which it is critical to monitor real-time battery performance. Used in conjunction with a microcontroller in the host system, the DS2438 provides a complete smart battery pack solution that is fully chemistry-independent. The customization for a particular battery chemistry and capacity is realized in the code programmed into the microcontroller and DS2438 EEPROM, and only a software revision is necessary should a designer wish to change battery pack chemistry.Applications
- Cell Phones
- Digital Still Cameras
- Digital Video Cameras
- Palmtops, Handy Terminals (incl. barcode)
- Pen Entry Palmtops, PDAs and Organizers
- Smart Battery Packs/Chargers
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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DS2438 Reliability Data1/12/2023PDF18K
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1-Wire Search Algorithm3/28/2002
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White Paper 2: Using the 1-Wire® Public Domain Kit7/16/2008
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White Paper 5: Using 1-Wire APIs for Data Sheet Commands6/7/2002
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1-Wire® Tagging with XML6/7/2002
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1-Wire Communication Through Software5/30/2002
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Using the DS2480B Serial 1-Wire® Line Driver3/12/2002
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Recommended ESD Protection and Circuit Placement for the DS2438 in Li-Ion Cell Pack Master5/7/2001
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Using Dallas Battery Management ICs with High Voltage Battery Packs5/1/2001
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Lithium-Ion Cell Fuel Gauging with Maxim Battery Monitor ICs3/29/2001
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Understanding and Using Cyclic Redundancy Checks with Maxim 1-Wire and iButton Products3/29/2001
Tools & Simulations
Software Development
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
PCN-PDN Information
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.